Table 1.

log K* (4N) values of Ni(II) complexes of comparable XYH peptides.

Peptide	Protein	Ref.		logK *	Coordination sphere
Boc-AGGH		[18]	−30.02		{NIm, 3N−}
Ac-ELAKHA-Am	Histone H2B	[19]	−28.87		{NIm, 3N−}
Ac-IQTAVRLLLPGELAKHAVSEGTKAVTKYTSSK-Am	Histone H2B	[20]	−28.83		{NIm, 3N−}
Ac-AKRHRK-Am	Histone H4	[21]	−28.70		{NIm, 3N−}
Ac- SGRGKGGKGLGKGGAKRHRKVL -Am	Histone H4	[22]	−28.67		{NIm, 3N−}
Ac-TESHHK-Am	Histone H2A	[23]	−28.58		{NIm, 3N−}
Ac-TEAHHK-Am	Histone H2A *	[23]	−28.41		{NIm, 3N−}
Ac-TESHAK-Am	Histone H2A *	[23]	−28.23		{NIm, 3N−}
Ac-AK(Ac)RHRK(Ac)V-Am	Histone H4	[22]	−28.20		{NIm, 3N−}
Ac-TESAHK-Am	Histone H2A *	[23]	−28.18		{NIm, 3N−}
Ac-TRSRSHTSEGTRSR-Am	Cap43	[24]	−28.16		{NIm, 3N−}
Ac-TYTEHA-Am	Histone H4	[25]	−27.92		{NIm, 3N−}
Ac-TASHHK-Am	Histone H2A *	[23]	−27.26		{NIm, 3N−}
NH2-GGHistamine		[26]	−22.65		{Nim, 2N−, NH2}
NH2-GGH		[15]	−21.81		{Nim, 2N−, NH2}
NH2-SAHK-Am	Histone H2A *	[27]	−21.80		{Nim, 2N−, NH2}
NH2-VIHN	Des-Angiotensinogen	[2]	−19.75		{Nim, 2N−, NH2}
NH2-DAHK-Am	Albumin	[15]	−19.48		{Nim, 2N−, NH2, O-}
NH2-RTHGQSHYRRRHCSR-Am	Protamine HP2	[28]	−19.29		{Nim, 2N−, NH2}
NH2-RTHGQ-Am	Protamine HP2	[28]	−19.23		{Nim, 2N−, NH2}
NH2-SHHK-Am	Histone H2A	[27]	−19.14		{Nim, 2N−, NH2}

* modified sequence of Histone H2A.